It's cold outside, but these social media-savvy stars are heating up Instagram!

We love this fun, active shot of the stunning singer that a fan posted on Instagram December 22, along with the caption “Natural beauty!” And a natural beauty she is! The 34-year-old star told SHAPE, “I’m more accepting of my body and have learned to really embrace it. These days it’s all about finding balance. My new motto is: ‘Stay active, eat everything in moderation, and stop being so tough on myself’.” She’s definitely in insane shape, thanks to a daily diet of healthy foods like soft-boiled eggs, smoked salmon, veggies, fruit, chicken, and fish.

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Candice Swanepoel

When you're a Victoria’s Secret model, you have to be bikini-ready year round. South African stunner Candice Swanepoel posted this super sexy behind-the-scenes photo on Instagram December 28, while shooting in St. Bart’s for the infamous lingerie catalog. To keep her figure flawless, the supermodel trains with Justin Gelband, and she also swears by yoga and boxing. Swanepoel stays away from soda to prevent bloating before a shoot, and she even packs ankle weights and a jump rope for on-the-go workouts. Who says being an Angel is easy?

RiRi knows how to rock a bikini any time of the year (and on any stage)! The 24-year-old singer is known for posting some of her sexiest pics ever on Instagram, so this sneak peek of her Barbados campaign that she tweeted on December 26 comes as no surprise. But getting her taut and tight tummy takes work; she’s trained with fitness expert Ary Nuñez for the past four years. “We focus on the core muscles, and we do a ton of repetitions,” Nuñez told SHAPE. “Rihanna is so connected to her body. She used to work out because it was part of her responsibility, but now she works out because she loves it!”

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Gabrielle Union

Super athletic actress Gabrielle Union posted this hot bikini shot on Instagram December 13, saying “From our backyard in Miami to our new home in China #loveisintheair.” There’s no doubt the 40-year-old beauty has a fabulous figure, and she's serious about her health too. While the former high school basketball, soccer, and track star doesn’t go crazy in the gym, she believes in all things moderation with a balanced diet and regular workouts. Her best asset, according to Union herself? Her booty!

“My butt has gotten a lot better because it’s bigger. I do squats and walk on inclines,” she told People. “I don’t look like a scarecrow anymore. I should really back into rooms because that’s how confident I am.” Gotta love that!

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Bar Refaeli

Bar Refaeli may look fierce on magazine covers, but she’s unstoppable in the gym! And the results are clearly working for her; she posted this gorgeous shot on her Instagram on January 1 with the caption “Chill”. The 27-year-old supermodel swears by Krav Maga, a fighting style that uses an intense combo of martial arts and boxing. “I don’t feel the need to be super-skinny, but being in shape is important. My trainer taught me all kinds of kicks and they work everywhere—your abs, your butt,” she’s said. Well, judging by this shot—she’s right!

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Cintia Dicker

Cintia Dicker is one busy girl. From being the face for Aerie to Victoria's Secret and Sports Illustrated, it's her job to stay lean and fit. Showing off her svelte shape, the 26-year-old model posted this beautiful shot on Instagram on January 5, along with the caption “New Life. #Meditation.”

Dicker might make looking so good seem easy, but she works hard to keep her bod beach-ready with lots of cardio, swimming, and walking on the treadmill. “I always have to pay attention to exercise and nutrition. I am always exercising at the gym, doing massages, and riding my bike at Central Park,” she told SI.com. “Having balanced nutrition is also very important to keep my body in shape and healthy.”

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Alessandra Ambrosio

A bad photo just might not be possible with this brunette bombshell. Case in point: The candid beach shot she uploaded to Instragram January 6. The 31-year-old model mom stays in angelic shape by training with Justin Gelband and also rocking the exercise program, “Brazil Butt Lift.” She told SHAPE backstage at the Victoria’s Secret Fashion Show that she preps for the runway with “Pilates and spinning… and a spray tan for an extra glow!” No question, she looks amazing!

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Lily Aldridge

Another Victoria’s Secret beauty, Lily Aldridge heat up Instagram on November 16 with this body-baring snapshot, writing “@victoriassecret #FunFriday.” When she’s not gracing the runway and countless lingerie spreads, you can find her doing Pilates and Ballet Beautiful. “[Ballet Beautiful] is ballet moves, what ballerinas do to get ready for their big days. It’s been amazing to really tighten my body, it made me long and lean!” she’s said.

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Nicole Scherzinger

We love this fun, active shot of the stunning singer that a fan posted on Instagram December 22, along with the caption “Natural beauty!” And a natural beauty she is! The 34-year-old star told SHAPE, “I’m more accepting of my body and have learned to really embrace it. These days it’s all about finding balance. My new motto is: ‘Stay active, eat everything in moderation, and stop being so tough on myself’.” She’s definitely in insane shape, thanks to a daily diet of healthy foods like soft-boiled eggs, smoked salmon, veggies, fruit, chicken, and fish.

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Heidi Klum

Supermodel Heidi Klum is no stranger to posting sizzling shots on social media, and this cleavage-baring pic is no different. The 39-year-old stunner tweeted on December 20, “Thank you for another beautiful day!” When it comes to keeping her bodacious bod magazine-ready no matter what the season, Klum is devoted to yoga, boxing, and running. To lose her pregnancy weight, she went to celebrity trainer David Kirsch and sweat up a storm with core exercises, lunges, squats, and shadow boxing.

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Joanna Krupa

One thing's for sure, Real Housewives of Miami star Joanna Krupa makes South Beach seem even hotter. The blonde bombshell uploaded this fun and flirty photo to Twitter January 1, writing “Cuddle time with @romain_zago.” So just how does she keep that bod so bikini-ready? “I typically like to do a whole-body workout. I do Pilates training once a week with a private trainer in L.A. But mainly I love doing classes—kickboxing, kettlebells; and this cardio 'pound' class with drumsticks at the Equinox gym in West Hollywood, which is so much fun and you really feel the burn,” the 33-year-old told Glamour Edition.

It's cold outside, but these social media-savvy stars are heating up Instagram!

Promo Subtitle

It may be cold outside, but these social media-savvy stars are heating up Instagram!